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Related Experiment Videos

N-Glycan processing by a lepidopteran insect alpha1,2-mannosidase.

Z Kawar1, P A Romero, A Herscovics

  • 1Department of Molecular Biology, University of Wyoming, Laramie, WY 82071-3944, USA.

Glycobiology
|April 15, 2000
PubMed
Summary

Insect alpha1,2-mannosidase (SfManI) processes Man(9)GlcNAc(2) to Man(5)GlcNAc(2) via Man(7)GlcNAc(2)isomer C. This insect enzyme differs from mammalian counterparts in its unique processing intermediate pathway.

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Area of Science:

  • Biochemistry
  • Glycobiology
  • Insect Cell Biology

Background:

  • Protein glycosylation in insect cells remains poorly understood.
  • Previous work identified an insect alpha1,2-mannosidase (SfManI) from Sf9 cells.

Purpose of the Study:

  • To characterize the substrate specificity of the insect alpha1,2-mannosidase (SfManI).
  • To compare SfManI processing of N-glycans with mammalian alpha1,2-mannosidases.

Main Methods:

  • SfManI was expressed using a recombinant baculovirus system and purified.
  • Oligosaccharide substrates were incubated with purified SfManI.
  • Products were analyzed using High-Performance Liquid Chromatography (HPLC) and 1H-NMR spectroscopy.

Main Results:

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  • SfManI rapidly converted Man(9)GlcNAc(2) to Man(6)GlcNAc(2)isomer C, then slowly to Man(5)GlcNAc(2).
  • The enzyme's processing primarily proceeds through Man(7)GlcNAc(2)isomer C.
  • This intermediate is a major processing product, distinguishing SfManI from mammalian enzymes.

Conclusions:

  • SfManI exhibits unique substrate specificity compared to mammalian alpha1,2-mannosidases.
  • SfManI is the first reported alpha1,2-mannosidase to produce Man(7)GlcNAc(2)isomer C as a major intermediate.
  • This finding advances the understanding of insect N-glycosylation pathways.